YSK: Use ‘a’ when the word starts with a consonant sound, and ‘an’ when it starts with a vowel sound

Why you should know: The ‘a’ vs ‘an’ conundrum is not about what letter actually begins the word, but instead about how the sound of the word starts.

For example, the ‘h’ in ‘hour’ is silent, so you would say ‘an hour’ and not ‘a hour’. A trickier example is Ukraine: because the ‘U’ is pronounced as ‘You’, and in this case the ‘y’ is a consonant, you would say “a Ukraine” and not “an Ukraine”.

Tip: when in doubt, sound it out(loud).

Reference

Thank you for coming to my TED talk.